Hooking the bp_ajax_querystring

I’ve create a members page that lists members using the member-loop.php and that has a Google Map to the right of the list. How do I hook the bp_ajax_querystring response so I can update my map when a user click on the “All Members” or “Following” tabs?

BP ajax is super slick, but a huge pain-in-the-ass when you’re trying to customize anything. That said, all the ajax goes through this file: /buddypress/bp-themes/bp-default/_inc/ajax.php so you can try to filter bp_dtheme_ajax_querystring in the default theme or bp_ajax_querystring in your own theme. Then there is the function just below that relating to wp_ajax_members_filter that might be useful to hook into. There is some magic happening in loading the template, which I tend to work around but dont fully understand. Good luck.

How do I get my child theme to override a function in the bp-default _inc/ajax.php file? The comments at the top of the file say that you can simply create your own ajax.php file but that does not seem to be working.